Extreme-ultraviolet structured beams via high harmonic generation
Extreme-ultraviolet structured beams via high harmonic generation
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DOI：
10.1140/epjs/s11734-022-00678-4
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发表时间：
2022-07
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通讯作者：
A. Pandey;A. de las Heras;J. Román;J. Serrano;L. Plaja;E. Baynard;M. Pittman;G. Dovillaire;S. Kazamias;C. Durfee;Carlos Hern'andez-Garc'ia;O. Guilbaud
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作者：
A. Pandey;A. de las Heras;J. Román;J. Serrano;L. Plaja;E. Baynard;M. Pittman;G. Dovillaire;S. Kazamias;C. Durfee;Carlos Hern'andez-Garc'ia;O. Guilbaud
大力利用光的拓扑特性的努力使许多新颖的应用成为可能。将结构光的应用转化为更高的空间和时间分辨率，要求它们在短波长范围内控制产生、操纵和彻底表征。在这里，我们利用稀有气体中的高次谐波产生（HHG）来上转换近红外（IR）矢量、涡旋和矢量涡旋驱动光束，这些光束分别具有定制的自旋角动量（SAM）、轨道角动量（OAM），并同时具有定制的SAM和OAM。我们表明，HHG可以控制极紫外（EUV）矢量光束的产生，这些光束具有各种空间依赖的偏振分布，或者具有高度扭曲相位的EUV涡旋光束。此外，我们还演示了具有矢量和涡旋光束组合特性的极紫外光矢量涡束（VVB）的产生。我们利用极紫外光前传感技术，明确地确认了超高压光束的拓扑电荷标度与谐波阶。有趣的是，我们的工作表明HHG允许对SAM和OAM进行同步控制操作。这些EUV结构光束在使用桌面谐波源的纳米空间和亚飞秒时间分辨率下带来了有希望的应用场景。
Vigorous efforts to harness the topological properties of light have enabled a multitude of novel applications. Translating the applications of structured light to higher spatial and temporal resolutions mandates their controlled generation, manipulation, and thorough characterization in the short-wavelength regime. Here, we resort to high-order harmonic generation (HHG) in a noble gas to upconvert near-infrared (IR) vector, vortex, and vector-vortex driving beams that are tailored, respectively, in their spin angular momentum (SAM), orbital angular momentum (OAM), and simultaneously in their SAM and OAM. We show that HHG enables the controlled generation of extreme-ultraviolet (EUV) vector beams exhibiting various spatially dependent polarization distributions, or EUV vortex beams with a highly twisted phase. Moreover, we demonstrate the generation of EUV vector-vortex beams (VVB) bearing combined characteristics of vector and vortex beams. We rely on EUV wavefront sensing to unambiguously affirm the topological charge scaling of the HHG beams with the harmonic order. Interestingly, our work shows that HHG allows for a synchronous controlled manipulation of SAM and OAM. These EUV structured beams bring in the promising scenario of their applications at nanometric spatial and sub-femtosecond temporal resolutions using a table-top harmonic source.